-Provide a better hint for service network stop

git-svn-id: https://svn.code.sf.net/p/xcat/code/xcat-core/trunk@1836 8638fb3e-16cb-4fca-ae20-7b5d299a9bcd

xCAT-server/share/xcat/netboot/rh/genimage

@@ -274,7 +274,6 @@ if [ "\$NFS" = "1" ]; then
   mkdir -p /rw/etc
   mkdir -p /rw/var/lib/dhclient
   cp /etc/resolv.conf /rw/etc/
-  echo xcatfs / aufs rw,_netdev 0 0 > /rw/etc/mtab
   cp /var/lib/dhclient/dhclient.leases /rw/var/lib/dhclient/dhclient-$prinic.leases
   mount -t aufs -o dirs=/rw:/ro mergedroot  /sysroot
   mkdir -p /sysroot/ro
@@ -282,6 +281,7 @@ if [ "\$NFS" = "1" ]; then
   mount --move /ro /sysroot/ro
   mount --move /rw /sysroot/rw
   cp /etc/resolv.conf /sysroot/etc/
+  echo xcatfs / aufs rw,_netdev 0 0 >> /rw/etc/fstab
 elif [ -r /rootimg.sfs ]; then
   echo Setting up squashfs with ram overlay.
   mknod /dev/loop0 b 7 0